Apple ITunes (Music) only allows adding to a new playlist not an existing one.

Music version 1.4.2.80

When I right-click on a tune and choose 'Add To Playlist' it only shows 'new playlist' and not any of the existing playlists like it used to.

It's frustrating as I often add tracks to multiple playlists with this function, now I have to scroll up and down the list of playlists on the LHS and drag the tune to them.